Miner&#39;s safety-lamp.



, Nb. 700,407. 'Patented May20, |902.v

A. M: 0AN0'0 a. F'. H. sTAm. mums SAFE-Tv LAMP. i Application med .ru1y1s, 1900.).v (no Model.) i {&

l 27 /NvEA/ro/s;

- [n a fw@ fh. JM, Y, '/eo. l By A nom/Ey a therein to the accompanying drawings.

v Io

UNITED., STATES PATENT a lANNA M. DANDO ANnrRANK H. ernia, or scRANToN, 12E NNs.YL'vANIA.`

. MINERS :#AFETv-LAMP..

' sPEcIFrcAfrroN forming partera' Letters Patent ne. 700,407; dated 2o, 1902.

i Application felled July 18,1900.

T all whom it 1mm/concern: f Y Be it known that we, ANNA lVLDANDO an FRANK H. STAIR,citizeus ofthe UnitedStates,l residing at Scranton, in the countyottcka,` wanna and State of Pennsylvania, have invented certain new and useful Improvements in Miners Safety-Lamps, of whichth'e following is a specification, reference beinghad This invention relates to miners safetylamps, and has for its objects to provide a simplified and 'more efficient magnetic locking device for suchv lampand otherwise constructing such la'mp so as not to be interfered with by uuauthorizedpersons, whereby mining disasters by explosionl might result.

To this end our invention consists of the construction, combination, and arrangement of the several parts, as herein described and illustrated in the accompanying drawings.

Referring to the drawings, Figure 1 is a side elevation of the bowl of one of our improved lampsl having the top removed. Fig. `2 is a top plan View of the said bowl. Fig. 3 is an u nder side View of the same. Fig. 4 is a View in cross-section taken on the lines x y of.Figs. 2 and 3. Fig.'5 isa detailview of aplug used in the locking device. Fig. 6 isa detailview of the armature usedin the locking device. Fig. 7 is a view of our lamp complete, sitting in the relationwith an electrical magnet as required to unlock the bowl from the top portion or' the lamp.

Similar characters of reference denote like 'and corresponding parts throughout the several views.

In the drawings, 1 designates the main body of the bowl of one of our lamps, .which is constrncted from brass or other suitable material.V It is provided with a screw-thread 2, by means of which it is to be securely attached to the upper portion 3 of a miners lamp of any usual construction.

O ur lamp is provided with a peculiar-shaped Wick-tube 4, having a screw-threaded connection '5 at the center of the top of the bowl and -provided with a thumb-screw 6, by means of which it may be inserted and removed after the Wick has been Ainserted into the interior of the tube. The upper portion of the Wicktube is plain and has sliding over it a sheath 7, which is Vintegrally made with a screwserui no. 24,117 kunnen f L. l

threaded vlug 8, having ascrew-threaded connectiou with the'threaded shank 9 of the pin 10, extending upward through atubeor covcringll inthe interiorfo'f the bowl. This pin is :provided with a collar1-2, which 'prevents` it` froinsliding downward through the bowl,l and is provided at the opposite 'end'with a thumbbutton 13,-whi'ch is secured thereto after the pin 10 is `inserted downward through the tubeto thefdistance of the collar12, the thumb-button furtherv serving to prevent thepin'rfrom sliding upward through the tube 11 of the lamp-bowl. By this arrangement the sheath 7is adapted to be raised and lowered on the' wick-tube 4 by turning y Ythe thumb-button113 to `thefright or left, as

required,the object being to 'vary the light producedand tohave` thevariation limited to such an amount as is thought requisite by the authorities having the care of the lamp.

An additional tube 14 extends vertically up through the bowl of theylamp and is provided with a revolving pin 15, also provided with a thumb-button 13 on the lower end and a serrated disk 16 onV the upper end.

Parallel to the upper end of this tube and in proximity to the serrated disk is a matchholding receptacle 17, which is adapted to hold an explosive match adapted to be set off by turning the button 13, so as to cause-theserrated disk 16 to grate upon the head of the match, thus'orming a lighting device in order to'light the 'Wick in the tube 4 without the necessity of unscrewing the bowl 1 from y the body 3 of the lamp.

The bowl is locked to the body of the lamp -as follows: A sliding pin 18 has its projecting end 19 extending upward through thev shoulder of the bowl in proximity to the thread 2. This pin is slidable vertically and is held to the upper part of its course by means of acoiledspring 20, impinging on the collar21 andgf'seated on the removable plug 22, the

lwerend of said pin being'provided with an K armature 23, which armature is incased in a bev protected from viewand interference by the hand of any unauthorized person. The pin 20 is secured into the .embossment 25 of the armature by a screw-threaded connection at 26,' and the armature, which is of course slidable upward and downward within its in- .brass orother suitable inclosure24, Iso as to IOD easement 24, may be attracted downward, depressing the end ol the pin 19 below the surface of the shoulderof the lamp by means of an electromagnet 27, mortised or secured into the top of a table 28 or other suitable place upon which to set the lamp when it is desired to unlock it.

The operation of the parts of our lamp are easily understood. The interior of the bowl of the lamp is filled with suitable oil, and a wick is secured in the tube 4E and extending outward at the top the maximum amount which is allowed for the lamp. This is done by an authorized person before the lamp is placed into the hands of a miner. A match is inserted into the receptacle 17, and the sheath 7 is adjusted downward, so that the wick is exposed about the top of the tube 4, the tube 4 having been previously screwed down to its proper limit into its place in the top of the bowl. The top part of the lamp is now screwed to the bowl the same as in any usual lamp of the kind; but it must be noted that a recess 29 is provided in the metal ol' the rim 30 of the lamp, which recess is adapted to receive the end 19 of the sliding pin 2O when the bowl is fully screwed home, the body of the lamp being turned in the process of securing the bowl to it in the direction of the arrow in Fig. 7, the rim 30 pressing the pin downward until the recess 20 reaches it, when the pin snaps into its place. Itis evident that all that is necessary to do in unlocking the lamp is to set it on a table 28, with the armature 23 over a magnet 27, which electromagnet is to be strong enough to overcome the tension of the spring 1S, so as to draw the pin down until the end lf) is withdrawn from the recess .29,when, of course, the lamp can be ber in one side of` said bowl, a spring-controlled sliding pin within said chamber, one end of said pin projecting upward and arranged to engage with a recess in the body of the lamp to which the said bowl is to be attached for the purpose of locking it thereto, and the other end of said pin provided with a comparatively large-sized armature lengthened so as to cover both poles of a horsehoemagnet and slidable within the chamber, the bottom of said chamber provided with a suitable closure, whereby the sliding pin may bc drawn downward by the action of au electromagnetwhen the lamp is placed in close relation to such magnet, for the purpose ol' disengaging the locking' device, and at the same time preventing any physical contact with the armature or pin from without, substantially as specified.

In testimony whereof we allix our signatures in presence of two witnesses.

ANNA M. DANDO. FRANK H. STAIR.

lVitnesses:

GRIFFITH D. WILLIAMS, FRED. XV. HERMANN. 

